904L

UNS N08904, commonly known as 904L with its DIN equivalent W.Nr. 1.4539, is a low carbon super austenitic stainless steel. It has superior corrosion resistance to that of conventional Cr-Ni stainless steels such as SS316L and SS317L resulting from the deliberate addition of copper content. Although the 904L stainless steel has limited use with hydrochloric acids, it has high resistance to pitting corrosion in chloride solutions, high resistance to both crevice and stress-corrosion cracking. The grade is non-magnetic and has excellent formability and weldability, as well as good toughness in cryogenic temperatures. 904L stainless steels have greater resistance to precipitation of ferrite and sigma phases on cooling and welding. The low carbon content reduces the risk of intercrystalline corrosion on cooling or welding processes. This super austenitic stainless steel is widely used in chemical processing, oil & gas, and pharmaceutical industries.

ASTM A312 UNS N08904(904L) seamless pipes, 12.7mmx1.25mmx6m.

1. Chemical Composition of 904L

The Chemical Composition of 904L, %

C

≤0.020

Mn

≤2.00

P

≤0.045

S

≤0.035

Si

≤1.00

Cr

19.0-23.0

Ni

23.0-28.0

Mo

4.0-5.0

N

≤0.10

Cu

1.0-2.0

2. Mechanical Properties of 904L

Tensile Strength, min.

Yield Strength, min.

Elongation, min.

ksi

Mpa

ksi

Mpa

%

71

490

31

220

35

3. Physical Properties of 904L

ASTM A276 904L (UNS N08904) round bars, Φ70mm.

Density

Specific Heat

Thermal Conductivity

Thermal Expansion

Modulus Elasticity

Electrical Resistivity

g/cm3

J/(kg*K)

W/(m*k)

mm/m/°C

Gpa

µohm/cm

7.95

450

11.5

15.8

190

9.52

4. Product Forms and Relative Standards

Product Form

Standard

Plates, Sheets & Strips

ASATM A240, A480

Bars, Rods, Billets

ASTM A276, A479

Forging(flanges, fittings, valve parts)

ASTM A182, A484

Seamless and welded pipes/ Tubes

ASTM A312, A269

Butt Welding pipe fittings

ASTM A403, ASME B16.9

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